The X-Savers are the prime suspect for me. 100% for most of those dropping to between 50 - 60%. The default Live backgrounds hover between 60 - 80%.

I managed to solve my uninstall problem in the end. Anyone else who has the same problem with Sherman's Aquarium and Live Wallpapers, you need to ignore what app manager is actually telling you and uninstall Sherman's Aquarium before Live Wallpapers.